chore: fix outdated lr_scheduler_name in docs

[dtch1997]

Description

Update default lr scheduler name in docs

Fixes #105

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have not rewritten tests relating to key interfaces which would affect backward compatibility

You have tested formatting, typing and unit tests (acceptance tests not currently in use)

• I have run make check-ci to check format and linting. (you can run make format to format code if needed.)

Performance Check.

If you have implemented a training change, please indicate precisely how performance changes with respect to the following metrics:

• L0
• CE Loss
• MSE Loss
• Feature Dashboard Interpretability

Please links to wandb dashboards with a control and test group.

[dtch1997]

@jbloomAus @chanind

[jbloomAus]

Thanks!